Final answer:
The American Heart Association protocol recommends a dose of 100 mg (1.5 mg/kg) over 5 minutes for Sotalol in treating stable wide-QRS tachycardia, avoiding usage if there is a prolonged QT interval.
Step-by-step explanation:
The dose for stable wide-QRS tachycardia using antiarrhythmic agent Sotalol, according to AHA protocol, is option a) 100 mg (1.5 mg/kg) over 5 minutes; avoid if prolonged QT. This medication is used to treat arrhythmias such as tachycardia with a pulse. The initial dose is important, and care must be taken to avoid use in patients with a prolonged QT interval to prevent potential side effects and complications. The medication must be administered in a controlled environment, where the patient's heart rate and rhythm can be closely monitored.